West Virginia, USA: Various shots of open-cast coal mine with lumps of coal being scooped up and loaded into trucks and lorries.

USA: Various shots of a coal-fired power plant emitting smoke from large chimneys, huge clouds of white smoke drifting with sunlight shining through, wide view of power plant seen from across the river.

Dead, leafless trees and a landfill form the frame for chimneys pumping out white smoke in the distance. Zoom out to reveal heavily degraded land.

Close view of smoke coming out of top of industrial chimney, next to tower block against orange sky

General view of two smoking factory chimneys and factory structure in silhouette against bright orange pink sky at sunset

Close view of tops of two factory chimneys belching and puffing steady stream of smoke upwards against cloudy sky

Wide shot of white smoke rising out of factory chimneys with hillside in the background.

Close up of smoking factory chimney in silhouette and two trails of black smoke against intense orange sky

General view of St Paul's Cathedral and part of Blackfriars bridge and the River Thames in silhouette on London skyline obscured by smoggy haze caused by air pollution

Berlin, Germany: Long view from Teufelsberg of smoke billowing from chimneys at industrial plant, with trees in foreground.

Aeroplane flying towards and over camera at low level with front lights on

Back view of the London Eye on a smoggy, hazy day caused by air pollution with Big Ben and other buildings seen in the background

St Paul's Cathedral and part of Blackfriars bridge in silhouette on London skyline seen through smoggy haze caused by air pollution

Medium close up of grey smoke billowing out of factory chimneys and in to the sky.

Side view of stationary motor cars in traffic queue with cloud of white exhaust fumes wafting through, then cars move off

White fumes puff out of car exhaust pipe as car pulls away, fumes obscure view of tarmac

Night shot of aeroplane taking off from airport runway over lampposts, plane seen mainly in silhouette but British Airways markings can be seen on tail fin with lights flashing

Large industrial chimney in smoggy surroundings in between two tower blocks

Berlin, Germany: Smoke billowing from large chimney of industrial.

Berlin, Germany: Close view of smoke billowing from chimneys.

Close view of stream of black smoke puffing and belching upwards

White fumes puff out of car exhaust pipe then car drives off leaving white cloud behind it

Very close shot of rusty car exhaust pipe emitting fumes, motor car is in motion and exhaust is shaking, fumes blow over camera lens

Close view of tops of two factory chimneys, one belching a stream of black smoke upwards

Back view of line of wheels of stationary cars in traffic queue with white exhaust fumes puffing from side

Mid shot of a factory chimney seen through clouds of thick, white smoke. Zoom out to reveal several chimneys and factory buildings.

Wide shot of leafless trees dying in the foreground and rising white smoke shrouding a pale blue sky in the distance.

Close view of top of chimney with black smoke billowing out against cloudy sky

Wide shot of hills and dark clouds with pond in foreground. Camera pans to reveal factories and chimney smokestacks churning out pollution.

Wide shot of blue sky and clouds. Camera tilts downwards to show brown smoke rising from factory chimneys and turning the sky yellow.

General view of two factory chimneys belching smoke in silhouette and factory structure in urban setting against intense orange sky

General view of clouds of black smoke wafting upwards into cloudy sky

A blue sky and white sun peek through shrouding white smoke rising from chimney smokestacks. Camera pans to reveal urban landscape on a sunny day.

General view of line of factory chimneys in silhouette belching black smoke against partially clear sky at sunset

Close view of top of factory chimney belching brown/black smoke with poles and wires crossing the screen in silhouette

Wide shot of silhouetted factory chimneys churning out grey smoke into sky, with clouds, smoke and bursts of sunshine, in Quebec.

General view of factory chimneys in silhouette belching black smoke against yellow sky at sunset

Top of chimney with black smoke billowing out against cloudy sky, then camera pulls out to show long factory chimney

Berlin, Germany: General view of smoke billowing from chimneys of industrial plant.

City of London skyline seen through pink smoggy haze caused by air pollution with Oxo building seen in foreground

Close view of tops of two chimneys belching smoke with poles and wires crossing factory structure in silhouette

Single smoking factory chimney seen on the horizon in the distance with trail of black smoke emanating over darkened skyline of town rooftops, the smoke passes over bright sun